Improvement in watches



UNITED STATES PATENT OEETCE.

G. MARTEN, OF CLEVELAND, OHIO.

IMPROVEMENT IN WATCHES.

Specification forming To all whom it may concern Be it known that I, G.(.l. MARTEN, of Cleveland, in the county of Ouyahoga and State of Ohio,have invented a new and useful improvement in Winding up lVatches; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawings,forming a part of this specification, in which- Figure 1 is a plan ortop view of the main spring-barrel of a watch constructed according tothis invention. Fig. 2 is a vertical central section of the same, theline :0 a", Fig. 1, indicating the plane of section. Fig. 3 is a similarsection of the outer barrel detached.

Similar letters of reference indicate like parts.

This invention consists of a mainspringbarrel composed of two barrels,one inside the other, the outer barrel being rigidly connected with themain gear-wheel and the inner barrel carrying the winding-arbor, themainspring, and the maintaining ratchet, or its equivalent, incombination with two stops or dogs, one applied to the inner and one tothe outer barrel in such a manner that when the spring is wound up theinner barrel turns independent of the outer barrel until the two stopsare in contact, and when the mainspring breaks the inner barrel fliesback and completes a full revolution, or nearly so, before its stopstrikes the dog of the outer barrel, and thus the force of the spring isspent and iijury to the mechanism of the watch is prevented.

A represents the main gear-wheel, which is rigidly connected to or madesolid with the outer barrel, B. This barrel is open at both ends, anditis bored or turned out to fit nicely over the inner barrel, 0. Thisbarrel is provided with two heads, a a, one fixed and the other movable,which form the bearings for the winding-arbor c, and it incloses themainspring d, one end of which is secured to the arbor and the other endto the interior of the barrel, as clearly shown in Fig. 2 of thedrawings. The winding arbor turns loosely in the heads and it extendsthrough both. One of part of Letters Patent No. 47,116, dated April 4,1865.

its ends forms the square to take the key and the other carries a dog orother equivalent device, which, in combination with a suitableratchetwheel or its equivalent, forms the maintaining power.

The barrel 0 turns freely within the barrel B in either direction untila stop, (I, which projects from the outer surface of the inner barrel,or any portion of the same, comes in contact with a stop, 0, projectingfrom the inner surface of the outer barrel. in the drawings, the stop dis attached to the head a of the barrel 0, as shown in Fig. 2, and theposition of the stop 6 is shown in Fig.

When the mainspring is wound, the stop (I of the inner barrel bearsagainst the stop 0 of the outer barrel, and both turn together in thedirection of the arrow marked thereon in Fig. 1, and the power of thespring is transmitted to the mechanism of the watch in the ordinarymanner; but if the mainspring breaks, it unwinds itself with all itsforce, which creates a reaction, causing the inner barrel to turn backin the direction opposite the arrow marked thereon in Fig. 1, until thestop (I strikes the stop 0 on the opposite side. During this retrogrademotion of the barrel 0 the force of the spring spends itself and thebarrel B remains perfectly stationary, and no part of the mechanism ofthe watch is liable to sustain any injury, where as in the common solidbarrel the force of the spring in unwinding would either bend or breakthe teeth of the barrel or the leaves of the pinion of the center-wheeland perhaps the pivot or jewel of the next following wheel.

It is obvious that the stops (1 6, instead of being applied to the twobarrels in the manner shown in the drawings, might be applied in variousdifferent ways-for instance, a groove might be turned in the outersurface of the inner barrel large enough to receive a projection securedto the inner surface of the outer barrel, and said groove might befilled up at one place by inserting a pin. I do not wish to confinemyself, therefore, to any particular position of the stops, and re-.serve the right to apply the same in any desirable manner.

power, in the manner and for the purpose sub- Having thus describdl myinvention, I l

s initially as herein set forth.

claim as new and desire to secure by Letters Patent- A mainspring-barreleenstrueted of an outer MARTEN' barrel, B, and an inner barrel, 0, whichare \Nitnesses:

provided with stopsd e, the inainspring, winding-arbor, and retainingand combined with FREDK. A. BRAND,

PHILIPP SUTORIUS.

